Question

我找不到能帮助我测试ViewModel的解决方案。我一直在读，添加规则就足够了：

 @get:Rule
 var rule: TestRule = InstantTaskExecutorRule()

但我不断得到：

java.lang.RuntimeException: Method getMainLooper in android.os.Looper not mocked. See http://g.co/androidstudio/not-mocked for details.

我的测试类现在看起来像这样：

@RunWith(MockitoJUnitRunner::class)
class MainActivityViewModelTest {

@get:Rule
val taskExecutorRule = InstantTaskExecutorRule()

val weatherProviderMock = mock<WeatherProvider>()
val sut = MainActivityViewModel(weatherProviderMock, mock(), mock(),     mock())

    @Test
    fun shouldPass() {
        assertTrue(true)
    }
}

我的应用程序build.gradle中也包含以下内容：

testImplementation 'junit:junit:4.12'
testImplementation "android.arch.core:core-testing:1.1.1"
testImplementation 'org.mockito:mockito-core:2.22.0'
testImplementation 'org.assertj:assertj-core:3.9.1'
testImplementation 'com.nhaarman:mockito-kotlin:1.6.0'
testImplementation 'org.mockito:mockito-inline:2.22.0'

任何帮助，不胜感激。

@Chris

能否请您告诉我下面的代码是否有问题（根据您建议的解决方案）：

lateinit var sut: SummaryViewModel
@get:Rule
val rule: TestRule = InstantTaskExecutorRule()

@Before
fun setUp() {
    sut = SummaryViewModel(calculatorMock, mock(), mock(), mock(), providerMock, mock())
}

@Test
fun `live data test`() {
    val someLiveData = sut.someLiveDataValue
    assertThat(true).isTrue()
}

Answer 1

您可以使用Kotlin delegates惰性地初始化ViewModel：

    val viewModel by lazy { 
        MainActivityViewModel(weatherProviderMock, mock(), mock()...)
    }

Looper未嘲笑ViewModel MockitoJUnitRunner

1 个答案: